Kindle Free Time Unlimited features content designed for kids between 3 and 8 years old, and it costs $2.99 per month for Amazon Prime members of $4.99 per month for anyone else.

There are also family-plans which let you access Free Time Unlimited on multiple devices for $6.99 (Prime members) or $9.99 (non-Prime subscribers) per month. The service is only available for Kindle Fire 2 and Kindle Fire HD tablet users. Other Android devices won’t work.

Amazon will begin rolling out a software updated for Kindle tablets later this month that will enable customers to start using the subscription service.

Content includes books, videos, and games from big names including PBS, Nickelodeon Disney, and DC Comics, just to name a few.

There are a few advantages to this sort of service. First, if you normally spend more than $3 (or $5, or $7, or $10) per month on Kindle content, this could provide you with a big library of content free of charge.

Second, all of the apps, videos, and other content have been pre-screened and deemed kid-friendly. So if you trust Amazon’s judgement, you don’t have to look over your kid’s shoulder every time they want to install a new app — because it won’t cost you any extra money and it hopefully won’t include mature content.

Parents can also use existing Kindle Free Time features to set limits on how much time kids spend using apps, watching videos, reading books, or surfing the web. You can also block activities entirely.